<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE CONDENSED CONSOLIDATED BALANCE SHEETS AT MARCH 31, 1998 AND 1997(UNAUDITED) AND THE CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND CASH FLOWS FOR THE THREE MONTHS ENDED MARCH 31, 1998 AND 1997(UNAUDITED) AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. </LEGEND> <PERIOD-TYPE> 3-MOS 3-MOS <FISCAL-YEAR-END> DEC-31-1997 DEC-31-1998 <PERIOD-START> JAN-01-1997 JAN-01-1998 <PERIOD-END> MAR-31-1997 MAR-31-1998 <CASH> 3,253,282 3,885,580 <SECURITIES> 0 0 <RECEIVABLES> 7,147,740 7,241,914 <ALLOWANCES> 183,478 158,165 <INVENTORY> 2,976,202 3,190,591 <CURRENT-ASSETS> 14,469,359 15,621,354 <PP&E> 14,073,331 15,812,295 <DEPRECIATION> 7,526,524 8,193,026 <TOTAL-ASSETS> 32,462,994 37,472,808 <CURRENT-LIABILITIES> 6,613,759 6,224,390 <BONDS> 0 0 <PREFERRED-MANDATORY> 0 0 <PREFERRED> 0 0 <COMMON> 34,414 34,629 <OTHER-SE> 24,964,595 29,709,540 <TOTAL-LIABILITY-AND-EQUITY> 32,462,994 37,472,808 <SALES> 13,980,931 15,140,373 <TOTAL-REVENUES> 13,980,931 15,140,373 <CGS> 7,999,524 8,717,688 <TOTAL-COSTS> 4,442,453 4,715,089 <OTHER-EXPENSES> 0 0 <LOSS-PROVISION> 0 0 <INTEREST-EXPENSE> (18,669) (29,281) <INCOME-PRETAX> 1,588,775 1,751,277 <INCOME-TAX> 632,333 697,009 <INCOME-CONTINUING> 0 0 <DISCONTINUED> 0 0 <EXTRAORDINARY> 0 0 <CHANGES> 0 0 <NET-INCOME> 956,442 1,054,268 <EPS-PRIMARY> .28 .30 <EPS-DILUTED> .27 .30